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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.7 $ -->
<!-- splitted from ./en/functions/network.xml, last change in rev 1.9 -->
<refentry id="function.syslog">
<refnamediv>
<refname>syslog</refname>
<refpurpose>Generate a system log message</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>bool</type><methodname>syslog</methodname>
<methodparam><type>int</type><parameter>priority</parameter></methodparam>
<methodparam><type>string</type><parameter>message</parameter></methodparam>
</methodsynopsis>
<para>
<function>syslog</function> generates a log message that will be
distributed by the system logger.
<parameter>priority</parameter> is a combination of the facility
and the level, values for which are given in the next section.
The remaining argument is the message to send, except that the
two characters <literal>%m</literal> will be replaced by the
error message string (strerror) corresponding to the present
value of <errortype>errno</errortype>.
</para>
<para>
<table>
<title><function>syslog</function> Priorities (in descending order)</title>
<tgroup cols="2">
<thead>
<row>
<entry>Constant</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry>LOG_EMERG</entry>
<entry>system is unusable</entry>
</row>
<row>
<entry>LOG_ALERT</entry>
<entry>action must be taken immediately</entry>
</row>
<row>
<entry>LOG_CRIT</entry>
<entry>critical conditions</entry>
</row>
<row>
<entry>LOG_ERR</entry>
<entry>error conditions</entry>
</row>
<row>
<entry>LOG_WARNING</entry>
<entry>warning conditions</entry>
</row>
<row>
<entry>LOG_NOTICE</entry>
<entry>normal, but significant, condition</entry>
</row>
<row>
<entry>LOG_INFO</entry>
<entry>informational message</entry>
</row>
<row>
<entry>LOG_DEBUG</entry>
<entry>debug-level message</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
<para>
<example>
<title>Using <function>syslog</function></title>
<programlisting role="php">
<![CDATA[
<?php
define_syslog_variables();
// open syslog, include the process ID and also send
// the log to standard error, and use a user defined
// logging mechanism
openlog("myScriptLog", LOG_PID | LOG_PERROR, LOG_LOCAL0);
// some code
if (authorized_client()) {
// do something
} else {
// unauthorized client!
// log the attempt
$access = date("Y/m/d H:i:s");
syslog(LOG_WARNING, "Unauthorized client: $access $_SERVER[REMOTE_ADDR] ($_SERVER[HTTP_USER_AGENT])");
}
closelog();
?>
]]>
</programlisting>
</example>
For information on setting up a user defined log handler, see the
<citerefentry><refentrytitle>syslog.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry> Unix manual page. More
information on the syslog facilities and option can be found in the man
pages for <citerefentry><refentrytitle>syslog</refentrytitle>
<manvolnum>3</manvolnum></citerefentry> on Unix machines.
</para>
<para>
On Windows NT, the syslog service is emulated using the Event
Log.
</para>
<note>
<para>
Use of <literal>LOG_LOCAL0</literal> through
<literal>LOG_LOCAL7</literal> for the <parameter>facility</parameter>
parameter of <function>openlog</function> is not available
in Windows.
</para>
</note>
<para>
See also <function>define_syslog_variables</function>,
<function>openlog</function> and
<function>closelog</function>.
</para>
</refsect1>
</refentry>
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